The only light came from the door, and from a small skylight in the sloping roof, which showed that it was a garret-room.
Nor did much light come from the open door, for there was no window on the walled stair to which it opened; only opposite the door a few steps led up into another garret, larger, but with a lower roof, unceiled, and perforated with two or three holes, the panes of glass filling which were no larger than the small blue slates which covered the roof: from these panes a little dim brown light tumbled into the room where the boy sat on the floor, with his head almost between his knees, thinking.
But there was less light than usual in the room now, though it was only half-past two o'clock, and the sun would not set for more than half-an-hour yet; for if Robert had lifted his head and looked up, it would have been at, not through, the skylight.

No sky was to be seen.

A thick covering of snow lay over the glass.

A partial thaw, followed by frost, had fixed it there--a mass of imperfect cells and confused crystals.

It was a cold place to sit in, but the boy had some faculty for enduring cold when it was the price to be paid for solitude.